CVE-2026-31405
Linux Kernel out-of-bounds read
- Published6 Apr 2026
Description
In the Linux kernel, the following vulnerability has been resolved: media: dvb-net: fix OOB access in ULE extension header tables The ule_mandatory_ext_handlers[] and ule_optional_ext_handlers[] tables in handle_one_ule_extension() are declared with 255 elements (valid indices 0-254), but the index htype is derived from network-controlled data as (ule_sndu_type & 0x00FF), giving a range of 0-255. When htype equals 255, an out-of-bounds read occurs on the function pointer table, and the OOB value may be called as a function pointer. Add a bounds check on htype against the array size before either table is accessed. Out-of-range values now cause the SNDU to be discarded.
CVSS 3.1 breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected products
Remediation
- https://git.kernel.org/stable/c/145e50c2c700fa52b840df7bab206043997dd18e
- https://git.kernel.org/stable/c/1a6da3dbb9985d00743073a1cc1f96e59f5abc30
- https://git.kernel.org/stable/c/24d87712727a5017ad142d63940589a36cd25647
- https://git.kernel.org/stable/c/29ef43ceb121d67b87f4cbb08439e4e9e732eff8
- https://git.kernel.org/stable/c/8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe
- https://git.kernel.org/stable/c/b2bd2ee73b697c177157bba534e1b1064c2e66a0
References
- https://git.kernel.org/stable/c/145e50c2c700fa52b840df7bab206043997dd18e
- https://git.kernel.org/stable/c/1a6da3dbb9985d00743073a1cc1f96e59f5abc30
- https://git.kernel.org/stable/c/24d87712727a5017ad142d63940589a36cd25647
- https://git.kernel.org/stable/c/29ef43ceb121d67b87f4cbb08439e4e9e732eff8
- https://git.kernel.org/stable/c/8bde543d2a5f935ba2a6a6325a2e02f8a9256fbe
- https://git.kernel.org/stable/c/b2bd2ee73b697c177157bba534e1b1064c2e66a0
- https://git.kernel.org/stable/c/e51238718217c4abdb3ccc3b0c0cde265c7ec629
- https://git.kernel.org/stable/c/f2b65dcb78c8990e4c68a906627433be1fe38a92
Related CVEs
Recent high-severity vulnerabilities sharing a weakness type.
Frequently asked
Is CVE-2026-31405 being actively exploited?
CVE-2026-31405 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.76%.
How severe is CVE-2026-31405?
CVE-2026-31405 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.76% probability of exploitation.
Which products are affected by CVE-2026-31405?
Affected products include Linux Kernel.
How do I fix CVE-2026-31405?
Upgrade affected software to a fixed version, for example Linux Kernel 5.10.253 or later, then confirm no affected versions remain in your inventory.
How Secuno handles this
Secuno correlates vulnerabilities like CVE-2026-31405 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.
Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.